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Arrayed waveguide grating type optical multiplexer/demultiplexer and optical waveguide circuit

a technology of optical multiplexers and optical waveguides, applied in optical waveguide light guides, instruments, optics, etc., can solve the problems of limited narrow wavelength intervals and likely variations in production

Inactive Publication Date: 2004-04-27
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an optical multiplexer / demultiplexer and an optical waveguide circuit used in optical communications and similar fields. The technical effects of the invention include the ability to multiplex and demultiplex light with a narrow wavelength interval, have flat wavelength flatness in the vicinity of the central wavelength, and low crosstalk between adjacent wavelengths. The invention uses an arrayed waveguide grating type optical multiplexer / demultiplexer and an optical waveguide circuit to achieve these technical effects.

Problems solved by technology

However, in the background art there are limits to how narrow a wavelength interval can be multiplexed.
However, the structure of the arrayed waveguide grating type optical multiplexer / demultiplexer having the slit-like waveguide 50 as shown in FIGS. 20A, 20B, and 21 is not simple and, hence, a problem arises in that variations in production are likely to result, and accordingly variations in abilities result.

Method used

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  • Arrayed waveguide grating type optical multiplexer/demultiplexer and optical waveguide circuit
  • Arrayed waveguide grating type optical multiplexer/demultiplexer and optical waveguide circuit
  • Arrayed waveguide grating type optical multiplexer/demultiplexer and optical waveguide circuit

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first embodiment

The first embodiment is thus structured. In this first embodiment also, similar to the background arrayed waveguide grating, the optical input waveguides 12 are connected to, for example, transmission side optical fibers (not shown) so that light that has undergone wavelength division multiplexing is introduced to the optical input waveguides 12. However, the light that has traveled through the optical input waveguides 12 in this first embodiment enters the straight waveguide 1, and the optical power center thereof is shifted to the center of the straight waveguide 1, to thereby enter the optical power center to the center in width of the trapezoidal waveguide 5.

By setting the normalized frequency (V value) to 2.4 or more, the light input to the trapezoidal waveguide 5 is broadened along the width of the waveguide as a multi-mode optical amplitude distribution. The light then travels along the trapezoidal waveguide 5 while changing its optical amplitude distribution. Because the wid...

second embodiment

The second embodiment thus provides, as in the first embodiment, an arrayed waveguide grating type optical multiplexer / demultiplexer in which the 1 dB band width is wide, the ripple is small, and the adjacent crosstalk is low.

Next, the third embodiment of an arrayed waveguide grating type optical multiplexer / demultiplexer according to the present invention will be described. In describing the third embodiment, portions which have already been explained in descriptions of the first and second embodiments are not discussed again. FIGS. 11A and 11B illustrate the structure of the junction between output ends of optical input waveguides 12 and the first slab waveguide 13 in the arrayed waveguide grating type optical multiplexer / demultiplexer of the third embodiment.

third embodiment

The third embodiment is structured in almost the same way as the first embodiment. However, the third embodiment differs from the first embodiment in that an equal or constant width waveguide 9 having the same width as the narrower end (upper base 4) of the trapezoidal waveguide 5 is provided between the output end of the straight waveguide (narrow straight waveguide) 1 and the trapezoidal waveguide 5. With this structure, the constant width waveguide 9 and the trapezoidal waveguide 5 constitute the multi mode waveguide in the

Since the third embodiment is structured in almost the same way as the first embodiment, the straight waveguide 1 shifts the optical power center to the center of the straight waveguide 1 and enters the light to the center in width of the constant width waveguide 9. By setting the normalized frequency (V value) to 2.4 or more, the light input to the constant width waveguide 9 is broadened along the width of the waveguide as multi-mode optical amplitude distribu...

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Abstract

An arrayed waveguide grating optical multiplexer / demultiplexer includes an arrayed waveguide connected to at least one first optical waveguide via a first slab waveguide, a plurality of second optical waveguides connected to the arrayed waveguide via a second slab waveguide. At least one multi-mode waveguide has a first end portion and a second end portion having a second width larger than a first width of the first end portion. The first end portion of each of the at least one multi-mode waveguide is connected to each of the at least one first optical waveguide. The second end portion of each of the at least one multi-mode waveguide is connected to the first slab waveguide. A width of the at least one multi-mode waveguide increases from the first end portion toward the second end portion and is configured to realize multi-mode.

Description

CROSS-REFERENCES TO RELATED DOCUMENTSThe present application is related to and claims priority on Japanese Patent Applications 11-370,602, filed on Dec. 27, 1999, 2000-58646, filed on Mar. 3, 2000, 2000-102473, filed on Apr. 4, 2000, and 2000-285448, filed Sep. 20, 2000, the entire contents of each of which are hereby incorporated herein by reference.1. Field of the InventionThe present invention relates to an arrayed waveguide grating type optical multiplexer / demultiplexer and an optical waveguide circuit which are used in the field of optical communications and similar fields.2. Discussion of the BackgroundRecently, in optical communications research and development of optical wavelength division multiplexing communications has actively been pursued as a way to exponentially increase transmission volume, and the results are being put into practice. Optical wavelength division multiplexing communications uses, for example, a technique of wavelength division multiplexing on a plural...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B6/34G02B6/12
CPCG02B6/12016G02B2006/12195
Inventor KASHIHARA, KAZUHISANARA, KAZUTAKA
Owner FURUKAWA ELECTRIC CO LTD